How to cut throttle if fuel pressure drops

kcc0521 said:

I have been thinking about trying to put a hobbs switch on my car and tie it into the throttle wire or something similar to kill power if fuel pressure drops. Has anyone done something similar to this? I think it could save a motor if something in fuel system fails. I think the hobbs switch below could be used and set between 25 and 60lbs.

https://www.summitracing.com/parts/nex-15718

Click to expand...

ProChargerTECH said:

I had a fuel pressure cut to my last cars ECU and it saved my motor.

Had a bad tank of fuel clog the filters, and well.... when the pressure dropped 15psi below what it should, it put the ECU into limp mode. I was sooooo happy that I had done that, or I would have been buying a new set of pistons. (30psi of boost, doesn't mess around when fuel pressure drops)

Click to expand...

ahl395 said:

Sorry for the slightly-off topic post, but personally I run a fuel pressure gauge with a low warning buzzer. If it drops below 40psi it goes off and I can get off the throttle. May be a cheaper/simpler option so I figured I'd suggest it.

Now if that's as good of a failsafe, probably not, since it relies on your reaction time as well.

Click to expand...